while True:
	try:
		k=0
		x=int(input())
		n=[]
		n.append(x)
		while n[k]!=0:
			k=k+1
			x=int(input())
			n.append(x)
		for i in n:
			h=100
			for j in range(1,i+1):
				h=h*0.7
			if i<>0:print('%.2f' % h)
	except EOFError:
		break